Post Processing of Stress Results With Results
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- Norma George
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1 LESSON 10 Post Processing of Stress Results With Results Objectives: To post-process stress results from MSC/NASTRAN. To use MSC/PATRAN to create fill and fringe plots to determine if the analyzed part will meet a customerdefined criteria or whether the part needs to be redesigned and re-analyzed. PATRAN 303 Exercise Workbook - Release
2 10-2 PATRAN 303 Exercise Workbook - Release 7.5
3 LESSON 10 Post Processing of Stress Results Model Description: In this exercise, you will examine the stress results of the clevis model analyzed using the MSC/NASTRAN code by rendering a variety of fringe and element fill plots. Suggested Exercise Steps: Exercise Procedure: Open the clevis.db database created in the previous exercise and turn off the deformed shape. Create a fringe plot of the Von-Mises stress in the clevis. Create and assign a new numerical range to the viewport. Use the name, my_range, and the values Start= and End=1000 to define the new range containing 15 subrange levels. Change the results label format to an exponential format. Render an element fill plot of the Von-Mises stresses. Create a Fringe plot of the Maximum Principal Stress for elements 1 through 20 only. Convert the stress tensor results to the scalar σ xx, and create a fringe plot of the results with respect to the cylindrical coordinate system you created when building the clevis model. Plot the results on all elements. Create a new viewport and name it, view. Create a new group containing only finite element entities and name it, fem1. Post the group fem1 in the viewport view. In the default_viewport create a fringe plot of the Von-Mises stresses. In the fem1 viewport create a new range ( to 20000) and then create a fringe plot of the 1st Invariant. 1. Open the clevis.db database created in the previous exercise and turn off the deformed shape. File/Open Database... Existing Database Name OK clevis.db PATRAN 303 Exercise Workbook - Release
4 Create a Von-Mises Stress Scalar Plot Select the reset Icon from the System icons menu. Create a Von-Mises Stress Scalar Plot 2. Create a fringe plot of the Von-Mises stress in the clevis. In this step, we will show you how to make Fringe Plots of Von Mises stresses using the Quick Plot and the Fringe forms. Needless to say, for this simple Fringe Plot, the Quick Plot form requires minimal input as compared to the Fringe forms. But, should the user desire to get more specialized results, the Fringe form will prove to be very useful. Now, let us proceed using the Quick Plot form type. Results Action: Create Object: Quick Plot Select Result Cases: Select Fringe Result: Quantity: Load_Case.1.SC1 Stress, Tensor Von Mises Turn on the Edge Display Display/Shading Show Edges 10-4 PATRAN 303 Exercise Workbook - Release 7.5
5 LESSON 10 Post Processing of Stress Results Now, let s see if the results are different using the Fringe form to plot the Von Mises stress. Object: Fringe Select Result Case(s): Load_Case.1.SC1 Select Fringe Result: Stress Tensor Quantity: Von Mises The two plots are identical, as they should be; you are plotting the same results. 3. Create and assign a new numerical range to the viewport. Use the name, my_range, and the values Start= and End=1000 to define the new range containing 15 subrange levels. Create and a New Results Range PATRAN 303 Exercise Workbook - Release
6 Create and a New Results Range By default, MSC PATRAN assigns Result ranges based on the Min/ Max values of the result dependent variable currently selected. In this step you will create a new range, which varies from 1000 to 22000, and apply this range to the fringe plot posted in the current viewport. Results Action: Create Object: Fringe Click on the Display Attributes button. Range... Define Range Create... New Range Name: my_range OK Then in the Ranges form, make sure the Data Method is set to Semi- Auto and set the starting point as and the end as Data Method: Semi-Auto Start: End: 1000 Calculate Assign Target Range to Viewport Cancel Choose my_range, Post Range to Viewport and click on OK in the Set Range form. Set Range: my_range OK Post Range to Viewport 10-6 PATRAN 303 Exercise Workbook - Release 7.5
7 LESSON 10 Post Processing of Stress Results In the Results form. Label Style... Label Format: Exponential OK Your fringe plot should look like the one shown in the figure below. 4. Render an element fill plot of the Von-Mises stresses. Fringe plots are based on averaging the stress results of the elements connected to a particular node. The averaging operation tends to lowpass filter the results, dampening out large variations of stresses across the elements. Ideally, as the element mesh density becomes finer, the stress jump across the elements will decrease and the averaging operation will not be so critical. Nevertheless, in general for coarse meshes one will obtain better accuracy with element fill plots. Create an Element Fill Plot In MSC PATRAN, one can individually color-code the elements with respect to a result attribute known at the center of the element. It has been shown in the finite element literature that the stresses at the PATRAN 303 Exercise Workbook - Release
8 Filter Display center of the element are most accurate provided a 2X2 Gauss integration is used for the numerical integration. In this step, you will create an Element Fill plot based on a Von-Mises scalar results. Action: Create Object: Fringe Now click on the Plot Options icon. Averaging Definition: Domain: None Extrapolation: Average Your Viewport should appear as follows. Filter Display 5. Create a fringe plot of the maximum principle stress for elements 1 through 20 only PATRAN 303 Exercise Workbook - Release 7.5
9 LESSON 10 Post Processing of Stress Results MSC PATRAN allows the user to filter the displayed results based on element ID s, results range, property type, etc. In this step, you will plot the maximum principal stress for elements 1:20. Action: Create Object: Fringe Click the Select Results Button Select Result Case(s): Load_Case.1.SC1 Select Fringe Result: Stress Tensor, Quantity: Max Principal Click on the Target Entities icon Target Entity: Elements Select Elements: Elm 1:20 Click on the Plot Options Button Averaging Definition: Domain All Entities PATRAN 303 Exercise Workbook - Release
10 Transform Result Coordinate Frame Transform Result Coordinate Frame 6. Convert the stress tensor results to the scalar σ xx, and create a fringe plot of the scalar with respect to the cylindrical coordinate system you created when building the clevis model. Plot the results on all elements. Action: Create Object: Fringe Click on the Select Results Button Quantity: X Component Click on the Target Entities button Target Entity: Current Viewport PATRAN 303 Exercise Workbook - Release 7.5
11 LESSON 10 Post Processing of Stress Results Click on the Plot Options button Coordinate Transformation: CID Select Coordinate Frame: Coord 1 Remember to turn on the Show Edge in Display/Shading... form. 7. Create a new viewport, and name it, view. Create a new group containing only finite element entities and name it, fem1. Post the group fem1 in the viewport view. In the default_viewport create a fringe plot of the Von-Mises stresses. In the fem1 viewport create a new range ( to 20000) and then create a fringe plot of the 1st Invariant. Create and Post Two Different Fringe Plots In this final step you will create fringe plots of the Von-Mises and Principal stresses in the clevis model. You will post each result type in a different viewport. Both viewports will be posted to the display screen. They will contain identical copies of the finite element model but different groups and each viewport will be assigned a unique range. PATRAN 303 Exercise Workbook - Release
12 Create and Post Two Different Fringe Plots The first thing to do is to create a Von Mises fringe plot in the existing viewport. Click on the Select Results Button Quantity: Von Mises Now, create a new viewport called view. Viewport/Create... New Viewport Name: Cancel view Now, create a new group call fem1, containing only FEM. Group/Create... New Group Name: Make Current Unpost All Other Groups Group Contents: Cancel fem1 Add All FEM Now, create a new range called range1, spanning from 20,000 to -20,000. Display/Ranges... Create... New Range Name: OK Data Method: range1 Semi-Auto PATRAN 303 Exercise Workbook - Release 7.5
13 LESSON 10 Post Processing of Stress Results Start: End: Calculate Assign Target Range to Viewport Cancel Click on the Select Results Button Finally, create a plot of the 1st invariant. Quantity: 1st Invariant Click on the Display Attributes button. Range... Set Range: range1 OK PATRAN 303 Exercise Workbook - Release
14 Create and Post Two Different Fringe Plots Your display screen should show the following viewports and fringe plots. File/Quit PATRAN 303 Exercise Workbook - Release 7.5
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